Floor cleaning machine



FIG. 1 is a perspective view of a floor cleaning machine showing my newdesign;

FIG. 2 is a second perspective view thereof.

FIG. 3 is a top view thereof.

FIG. 4 is a front view thereof.

FIG. 5 is a left view thereof.

FIG. 6 is a right view thereof; and,

FIG. 7 is a rear view thereof. The broken lines depict portions of thefloor cleaning machine that form no part of the claimed design.

The ornamental design for a floor cleaning machine, as shown anddescribed.